MIX 3 undetected to Mi Unlock (MIX 1 did)

[TesteurYoutube]

Hello, i have unlocked my MIX 1 now, all perfect, Xiaomi.eu rom installed ♥
but my MIX 3 (palace museum) nothing in Mi unlock.... flash 2 sec then disapear...so i can't click unlock
(ADB ok, driver ok, ALL PERFECT, cause i unlocked MIX 1...)
so...help me please x)

 

[gogocar62]

You can only unlock one phone per month with one account.

 

[TesteurYoutube]

ok thanks (i tried to unlock this mix 3 since lots of month, and nothing.... so i tried with MIX 1 and it's worked, but in september, august etc i already tried to unlock MIX 3 but nothing...)